So that I end up with a single line graph with 2 lines for each tree, one for sun leaves and one for shade leaves. I have tried this before but Graph Builder only accepts one overlay. My data is arranged in 4 different columns: 1 for leaf area, 1 for leaf age, 1 for tree number and 1 for canopy position.

I have a bit of experience making small modifications to scripts that graph builder creates but I am not a programmer and my attempts have been unsuccessful so far, I would very much appreciate any help on this.